Question: Which is the tungsten alloy that has an effect on tungsten carbide exposure and starts with the letter c?
Paraphrase: What is the alloy of tungsten that affects the exposure of tungsten carbide and starts with letter c?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q37789249 . ?sbj wdt:P1542 wd:Q21175402 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25